/*
 * Copyright (C) 2006-2017 Oracle Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include "vbox_drv.h"
#include "vbox_err.h"
#include "vboxvideo_guest.h"
#include "vboxvideo_vbe.h"
#include "hgsmi_channels.h"

/**
 * Set a video mode via an HGSMI request.  The views must have been
 * initialised first using @a VBoxHGSMISendViewInfo and if the mode is being
 * set on the first display then it must be set first using registers.
 * @param  ctx           The context containing the heap to use
 * @param  display       The screen number
 * @param  origin_x      The horizontal displacement relative to the first scrn
 * @param  origin_y      The vertical displacement relative to the first screen
 * @param  start_offset  The offset of the visible area of the framebuffer
 *                       relative to the framebuffer start
 * @param  pitch         The offset in bytes between the starts of two adjecent
 *                       scan lines in video RAM
 * @param  width         The mode width
 * @param  height        The mode height
 * @param  bpp           The colour depth of the mode
 * @param  flags         Flags
 */
void hgsmi_process_display_info(struct gen_pool *ctx, u32 display,
				s32 origin_x, s32 origin_y, u32 start_offset,
				u32 pitch, u32 width, u32 height,
				u16 bpp, u16 flags)
{
	struct vbva_infoscreen *p;

	p = hgsmi_buffer_alloc(ctx, sizeof(*p), HGSMI_CH_VBVA,
			       VBVA_INFO_SCREEN);
	if (!p)
		return;

	p->view_index = display;
	p->origin_x = origin_x;
	p->origin_y = origin_y;
	p->start_offset = start_offset;
	p->line_size = pitch;
	p->width = width;
	p->height = height;
	p->bits_per_pixel = bpp;
	p->flags = flags;

	hgsmi_buffer_submit(ctx, p);
	hgsmi_buffer_free(ctx, p);
}

/**
 * Report the rectangle relative to which absolute pointer events should be
 * expressed.  This information remains valid until the next VBVA resize event
 * for any screen, at which time it is reset to the bounding rectangle of all
 * virtual screens.
 * @param  ctx       The context containing the heap to use.
 * @param  origin_x  Upper left X co-ordinate relative to the first screen.
 * @param  origin_y  Upper left Y co-ordinate relative to the first screen.
 * @param  width     Rectangle width.
 * @param  height    Rectangle height.
 * @returns 0 on success, -errno on failure
 */
int hgsmi_update_input_mapping(struct gen_pool *ctx, s32 origin_x, s32 origin_y,
			       u32 width, u32 height)
{
	struct vbva_report_input_mapping *p;

	p = hgsmi_buffer_alloc(ctx, sizeof(*p), HGSMI_CH_VBVA,
			       VBVA_REPORT_INPUT_MAPPING);
	if (!p)
		return -ENOMEM;

	p->x = origin_x;
	p->y = origin_y;
	p->cx = width;
	p->cy = height;

	hgsmi_buffer_submit(ctx, p);
	hgsmi_buffer_free(ctx, p);

	return 0;
}

/**
 * Get most recent video mode hints.
 * @param  ctx      The context containing the heap to use.
 * @param  screens  The number of screens to query hints for, starting at 0.
 * @param  hints    Array of vbva_modehint structures for receiving the hints.
 * @returns 0 on success, -errno on failure
 */
int hgsmi_get_mode_hints(struct gen_pool *ctx, unsigned int screens,
			 struct vbva_modehint *hints)
{
	struct vbva_query_mode_hints *p;
	size_t size;

	if (WARN_ON(!hints))
		return -EINVAL;

	size = screens * sizeof(struct vbva_modehint);
	p = hgsmi_buffer_alloc(ctx, sizeof(*p) + size, HGSMI_CH_VBVA,
			       VBVA_QUERY_MODE_HINTS);
	if (!p)
		return -ENOMEM;

	p->hints_queried_count = screens;
	p->hint_structure_guest_size = sizeof(struct vbva_modehint);
	p->rc = VERR_NOT_SUPPORTED;

	hgsmi_buffer_submit(ctx, p);

	if (RT_FAILURE(p->rc)) {
		hgsmi_buffer_free(ctx, p);
		return -EIO;
	}

	memcpy(hints, ((u8 *)p) + sizeof(struct vbva_query_mode_hints), size);
	hgsmi_buffer_free(ctx, p);

	return 0;
}